| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 53d - Lake Michigan Lacustrine Clay Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54220 - Manitowoc, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 15 | 24 | 34 | 44 | 54 | 60 | 59 | 51 | 41 | 29 | 17 | 37 |
| Avg Max Temp (°F) | 26 | 30 | 40 | 52 | 65 | 75 | 79 | 77 | 70 | 57 | 43 | 31 | 54 |
| Avg Precip (In.) | 1.71 | 1.24 | 2 | 2.82 | 2.81 | 3.29 | 3.38 | 3.72 | 3.17 | 2.28 | 2.32 | 1.74 | 30.5 |